CN101500169A - Multiplex audio/video compression transmission server - Google Patents
Multiplex audio/video compression transmission server Download PDFInfo
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- CN101500169A CN101500169A CN 200910061077 CN200910061077A CN101500169A CN 101500169 A CN101500169 A CN 101500169A CN 200910061077 CN200910061077 CN 200910061077 CN 200910061077 A CN200910061077 A CN 200910061077A CN 101500169 A CN101500169 A CN 101500169A
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Abstract
The invention relates to a compressed transmission server of multipath audio and video, comprising an audio encoder/decoder, a video encoder/decoder, a digital signal processor (DSP), an ARM micro-processor, an Ethernet port, a serial port, a hard disk interface, a power circuit, an external microphone, a camera and a tripod head. Independent DSP chip and ARM chip are adopted to assemble a DSP+ ARM framework on a board; the tripod head is controlled by the ARM micro-processor through the serial port so as to realize the rotation and zoom of the camera, the audio and video analog signals are collected on-site in real time and are sent to the digital signal processor after an A/D conversion carried out by the audio and video decoder, and then a compressed encoding is carried out; the video signal is compressed by H.264 arithmetic, the audio signal is compressed by G.264 arithmetic, the code stream data is read by a HPI interface of the digital signal processor, and local hard disk storage and network transmission are carried out, thus realizing the real-time control of the on-site audio and video. The server has strong control and network function, good flexibility, extensibility and upgradeability.
Description
Technical field
The present invention relates to a kind of multiplex audio/video compression transmission server.
Background technology
The various fields of people in social production and life adopted the video monitoring technology, obtained good social benefit and economic benefit.Continuous development along with Digital Video Processing technology, the communication technology, network technology, video monitoring The Application of Technology place is variation day by day, the demand of video monitoring and corresponding solution also emerge in an endless stream, and video monitoring has entered digitized cybertimes from traditional simulation monitoring.Many watch-dogs have the ability of uninterrupted monitoring in 24 hours, and can remote monitoring, live video etc.
For some independent small-sized watch-dogs, need independently compressed and multiplexed system, stable multiplexing ability, and the development of existing digital signal processing chip and compression treatment technology can realize the Real Time Compression transmission of multichannel audio-video frequency.The existing at present independently equipment of the Real Time Compression transmission of DSP realization multichannel audio-video frequency that adopts; The solution that adopts the ARM+ASIC chip is also arranged, and wherein ARM realizes complicated control and network function, and ASIC is used to look the real time codec of audio frequency.In addition, the scheme of the DaVinci double-core chip of American TI Company, with chip integrated DSP and ARM nuclear, also can realize above-mentioned functions.
Such scheme respectively has pluses and minuses, monolithic DSP scheme wherein, and cost is lower, uses flexibly, but since the restriction of DSP performance characteristics, the performance relative deficiency at aspects such as control and managed storage.Control of the scheme of ARM+ASIC chip and network function are powerful, but because the use asic chip is looked the compression of audio frequency, can't upgrade and improve the function relative fixed of system looking the audio compression system.The scheme of DaVinci double-core chip, owing to adopt the chip of single double-core, the volume ratio of system equipment is less, stability is high, but because the user to the understanding and the development difficulty of chip, answers expenditure to have much room for improvement, be single chip owing to what adopt simultaneously, system lacks enough flexibilities.
Summary of the invention
The objective of the invention is at the problems referred to above, a kind of multiplex audio/video compression transmission server is provided, independent ripe DSP and two chips of ARM are integrated on the plank, obtain powerful control and network function, and can adopt various advanced persons' audio/video encoding/decoding algorithm neatly, can upgrade separately management control system on the ARM chip, the audio frequency and video compression algorithm on the dsp chip of also can upgrading has very strong flexibility and compatibility.
The present invention in order to achieve the above object, a kind of multiplex audio/video compression transmission server is provided, comprise audio codec, Video Codec, digital signal processor DSP, the ARM microprocessor, Ethernet interface, serial ports, hard-disk interface, the microphone of power circuit and peripheral hardware, camera and The Cloud Terrace, adopt independently DSP and two chips of ARM are integrated in a DSP+ARM framework on the plank, audio codec links to each other with the McASP of digital signal processor, Video Decoder links to each other with the Video Ports of digital signal processor, digital signal processor and ARM microprocessor all contain outside SDRAM, the FLASH circuit, digital signal processor links to each other by the HPI interface with the ARM microprocessor, ARM microprocessor and Ethernet interface, serial ports, the hard-disk interface circuit links to each other, and adopts built-in Linux operating system.
The Video Ports of described digital signal processor DSP has VP0, VP1, three interfaces of VP2, and each interface has A and two passages of B respectively.Described Video Codec is made up of Video Decoder, video encoder, video input/output interface, Video Codec links to each other with the Video Ports of digital signal processor DSP, the A channel of VP0 is connected with the Video Decoder of the 1st path, the A channel of VP1 is connected with the Video Decoder of the 2nd path, the A channel of VP2 is connected with the Video Decoder of the 3rd path, the B passage of VP2 is connected with the Video Decoder of the 4th path, video encoder is connected with the A channel of VP0, and is multiplexing with the Video Decoder of the 1st path.Such connection has realized four road BT.656 interface videos inputs that walk abreast.The A channel of VP0 also is connected with video encoder simultaneously, and is multiplexing with the Video Decoder of the 1st path, realizes the demonstration of local picture in needs.
Described audio codec has audio interface, audio codec links to each other with the McASP of digital signal processor DSP, and its running parameter is set with configuration that the iic bus that uses DSP carries out audio codec, use the McASP of DSP and the exchange that audio codec carries out data to transmit its A/D, D/A data.
Described digital signal processor DSP contains outside SDRAM, FLASH circuit, finishes the compression and decompression of multichannel independence audio frequency and video by digital signal processor DSP.Described ARM microprocessor also contains outside SDRAM, FLASH circuit, and the ARM microprocessor links to each other by the HPI interface with digital signal processor, realizes the control of system and the transmission of data by the ARM microprocessor.
The present invention adopts two chips of DSP and ARM independently is integrated in a DSP+ARM framework on the plank, digital signal processor DSP carries out encoding compression after the multichannel audio-video frequency signal is gathered in real time, with ARM microprocessor shared data address, HPI adopts the mode of interrupt mode and inquiry to combine and communicates by letter by the HPI mode.
Described DSP adopts the mode of software inquiry to the transfer of data of ARM, after video coding one frame data are finished, leave dsp system running state data, audio compression data, the video compression data of needs feedback in appointment shared address zone 1 successively, this address of ARM system queries, and copy obtains data, network control program on the ARM is packaged into the IP bag, and sends by Ethernet interface.
Described ARM adopts the mode of interrupting to the transfer of data of DSP, after arm processor receives control command and other data by network, leave control command and other data in appointment shared address zone 2 successively, and to dsp processor transmission interruption, the dsp system response is interrupted, obtain control command and other data, and handle accordingly.
Described multiplex audio/video compression transmission server adopts the multichannel audio-video frequency signal and encodes after gathering in real time and transmit, or adopts the multichannel audio-video frequency compressed bit stream of real-time reception is decoded and displayed the play.H.264 vision signal adopts that algorithm compresses, and G.729 audio signal adopts that algorithm compresses.
Described ARM microprocessor links to each other with Ethernet interface, serial ports, hard-disk interface, and the ARM microprocessor links to each other with the 10M/100M ethernet controller, and ethernet controller connects network transformer, sends to audio-video code stream on the network in real time by the RJ45 port; ARM microprocessor UART module links to each other with the RS232 level transferring chip, and the The Cloud Terrace of control camera realizes that camera rotates, zoom function; The ARM microprocessor links to each other with the ATA hard-disk interface, by hard disk with the code stream real-time storage.
The used power supply of multiplex audio/video compression transmission server of the present invention adopts the 12V power supply, and according to the different requirements of each chip, provides voltages such as 5V, 3.3V, 1.8V, 1.4V.
Multiplex audio/video compression transmission server employing of the present invention is integrated in independent ripe DSP and two chips of ARM on the plank, transmits with the compression that the chip and the algorithm of relatively stable maturation are realized multichannel audio-video frequency.Book server is different from that the audio frequency and video compressed capability of single-chip DVR or video server is relatively poor, network function is comprehensive inadequately, also is different from the DaVinci technology that adopts the DSP+ARM kernel, has cost advantage and compound mode is more flexible.
Multiplex audio/video compression transmission server of the present invention has following advantage:
1, multiplex audio/video compression transmission server of the present invention adopts advanced system configuration, use the video/audio compress technique, the transmission image is clear fast, can carry out functions such as this locality, video recording in real time, remote inquiry, playback, remote real-time monitoring, long-range cradle head control, zoom.
2, the present invention is integrated in independent ripe DSP and two chips of ARM on the plank, transmits with the compression that the chip and the algorithm of relatively stable maturation are realized multichannel audio-video frequency.Adopt DSP+ARM double-core framework than adopting the scheme of DSP that stronger control and network function are arranged separately, better than the scheme extensibility upgradability that adopts ARM+ hardware compression chip, can also select wired or wireless mode to carry out Network Transmission according to demand, compare with the DaVinci family chip of same employing DSP+ARM kernel and have cost advantage and compound mode is more flexible.
3, DSP of the present invention communicates by letter with ARM and adopts the mode of HPI shared address to communicate by letter, DSP is inquired about by 3 milliseconds of timers by the systems soft ware of ARM to the data of ARM and obtains, ARM notifies DSP to obtain by ARM to the mode that DSP sends interruption to the data of DSP, make full use of the control and treatment ability of ARM like this, make full use of the data-handling capacity of DSP simultaneously, reduce influence to greatest extent the DSP data-handling efficiency.
4, multiplex audio/video compression transmission server of the present invention is gathered audio, video data in real time, carries out storing behind the compressed encoding, can send to network by wired or wireless mode, and pc client can carry out remote monitoring.Book server not only can be used for the video monitoring or the video storage field of specialties such as video conference, inquiry system, also can be widely used in monitoring, commander, the dispatching patcher of industries such as public security, fire-fighting, military affairs, meteorology, railway, aviation, market application foreground is wide.
Description of drawings
Fig. 1 is a multiplex audio/video compression transmission server parts composition frame chart of the present invention;
Fig. 2 is the audio codec circuit block diagram of server of the present invention;
Fig. 3 is the Video Decoder circuit block diagram of server of the present invention;
Fig. 4 is the video encoder circuit block diagram of server of the present invention;
Fig. 5 is the ARM microprocessor of server of the present invention and coupled ethernet controller, serial ports, hard-disk interface circuit block diagram;
Fig. 6 is the power supply schematic diagram of server of the present invention.
Fig. 7 is the schematic diagram that DSP and ARM carry out transfer of data among the present invention by HPI.
Fig. 8 is to be the video monitoring system connection diagram of core with server of the present invention;
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment 1: a kind of multichannel real-time audio and video compression transmission server of the present invention, critical piece comprises microphone, camera and the The Cloud Terrace of audio codec, Video Codec, digital signal processor DSP, ARM microprocessor, Ethernet interface, serial ports, hard-disk interface, power circuit and peripheral hardware shown in the block diagram of Fig. 1.The present invention adopts two chips of digital signal processor DSP and ARM independently is integrated in a DSP+ARM framework on the plank, audio codec links to each other with the McASP of digital signal processor, Video Decoder links to each other with the Video Ports of digital signal processor, digital signal processor and ARM microprocessor all contain outside SDRAM, FLASH circuit, digital signal processor links to each other by the HPI interface with the ARM microprocessor, the ARM microprocessor links to each other with Ethernet interface, serial ports, hard-disk interface circuit, adopts built-in Linux operating system.
Microphone, loud speaker, camera and monitor that book server is external are referring to Fig. 2,3 and 4.
Microphone, loud speaker are connected on the audio codec outward among Fig. 2, can gather simulated audio signal in real time with different sample frequencys, carry out sending to after the analog-to-digital conversion McASP module of digital signal processor, G.729 DSP adopts to audio signal that algorithm compresses.DSP also can decompress to audio code stream, by the external loudspeaker plays sound of audio codec.Parameters such as the sample rate of audio codec can be configured by iic bus by digital signal processor.
Camera and The Cloud Terrace are connected on outward on the Video Decoder among Fig. 3, can external a plurality of cameras and The Cloud Terrace, and have 4 Video Decoders and link to each other with the Video Ports of DSP, Video Ports has VP0, VP1, three interfaces of VP2, each interface have A and two passages of B respectively.The A channel of VP0 is connected with the Video Decoder of the 1st path, the A channel of VP1 is connected with the Video Decoder of the 2nd path, the A channel of VP2 is connected with the Video Decoder of the 3rd path, the B passage of VP2 is connected with the Video Decoder of the 4th path, has realized four road BT.656 interface videos inputs that walk abreast like this.The A channel of VP0 also is connected with video encoder simultaneously, and is multiplexing with the Video Decoder of the 1st path, realizes that in needs the output of video pictures shows.Book server can be exported 1 tunnel composite video signal (CVBS) or 1 road S-Video signal, can realize that also the red R of image, green G, three passage colors of blue B export respectively; Iic bus by DSP is provided with internal register, can export 8 ITU-R BT.656 signals of 4: 2: 2.
DSP adopts respectively maximum four tunnel vision signals of importing and H.264 compresses and transmit, and can also decode and display the play the multichannel audio-video frequency compressed bit stream of real-time reception, referring to Fig. 4.
Server A RM microprocessor of the present invention links to each other with Ethernet interface (Ethernet), serial ports (RS232/485), hard-disk interface.Referring to Fig. 5.The ARM microprocessor links to each other with the 10M/100M ethernet controller, and ethernet controller connects network transformer, sends to audio-video code stream on the network in real time by the RJ45 port; ARM microprocessor UART module links to each other with the RS232 level transferring chip, and serial ports can monitor the ruuning situation of ARM microprocessor, also can control the The Cloud Terrace of camera simultaneously and realize that camera rotates, zoom function; The ARM microprocessor links to each other with the ATA hard-disk interface, can control the ide interface hard disk, by hard disk with the code stream real-time storage.
Server of the present invention adopts built-in Linux operating system, and each interface is managed and controls, and supports ICP/IP protocol stack, FAT32 file system.Ethernet controller sends to Ethernet with the audio-video code stream data in the multicast mode, monitors in real time for pc client, and pc client also can send order to multichannel real-time audio and video compression transmission system simultaneously.
The power circuit of server of the present invention is referring to Fig. 6, adopts the 12V power supply, and according to the different requirements of each chip, provides 5V, 3.3V, 1.8V, 1.4V voltage respectively to chip power supplies such as DSP, ARM, video and audio coding, ethernet controllers.
Referring to Fig. 7, digital signal processor HPI part is packed video/audio code stream and is sent to the ARM microprocessor by the HPI interface.DSP communicates by letter with ARM and adopts the mode of HPI shared address to communicate by letter, DSP is obtained by the systems soft ware inquiry of ARM to the data of ARM, ARM notifies DSP to obtain by ARM to the mode that DSP sends interruption to the data of DSP, the control and treatment ability of the ARM that makes full use of like this makes full use of the data-handling capacity of DSP simultaneously.
Embodiment 2: a kind of application example of multichannel real-time audio and video compression transmission server of the present invention, system connects as shown in Figure 8.With the server of the embodiment of the invention 1 core as video monitoring system, external 4 cameras and 1 microphone, can control the The Cloud Terrace of camera by serial ports, in order to adjust the direction and the focal length of camera, on-the-spot audio frequency and video are gathered in real time, after carrying out analog-to-digital conversion, by algorithm H.264 and G.729 algorithm compress, compressed code flow is transferred to ARM by the HPI mode again, store by hard disk on the one hand, send to host computer by Ethernet on the other hand, can carry out remote monitoring simultaneously by a plurality of host computers.The audio frequency simulation data of looking that collect are carried out analog-to-digital conversion, compressed encoding etc. by server, and regeneration Ethernet data bag sends in the network with the multicast form.By Surveillance center's master control, be responsible for the relevant monitoring parameter of configuration etc., and can monitor simultaneously by a plurality of control points, as carrying out soft decoding monitoring by PC or portable notebook among the figure, also can adopt multichannel hardware decoding deck decoding back to monitor by monitor.
Server of the present invention also show aspect extensibility flexibly, reliable and stable data protection and the Safety Design original.As supporting 2 built-in hard disks, each hard disk can be supported the memory capacity of 320GB; Support the internal memory calibration technology, can online dilatation and maintenance, maximization system line duration can be checked system mode, network interface card operating state, conveniently understands running situation, guarantees system safety.The present invention also has high performance-price ratio, and in the ad eundem product, price is low, and the client can save a large amount of electricity charge in long-term use, reduces the long-term use cost of user, client's using value is maximized realization efficiency ratio and cost performance two excellent.
Multichannel real-time audio and video compression transmission server of the present invention adopts DSP+ARM double-core framework; have very strong control and network function; extensibility and upgradability are good, can upgrade protection user's hardware investment as required respectively to the systems soft ware on DSP or the ARM.The present invention also has cost advantage and reaches compound mode flexibly, can pass through the modem connection with GPRS or CDMA of ARM serial ports or network interface, realizes radio communication, and market application foreground is wide.
Claims (5)
1, a kind of multiplex audio/video compression transmission server, comprise audio codec, Video Codec, digital signal processor DSP, the ARM microprocessor, Ethernet interface, serial ports, hard-disk interface, the microphone of power circuit and peripheral hardware, camera and The Cloud Terrace, it is characterized in that adopting two chips of DSP and ARM independently are integrated in a DSP+ARM framework on the plank, audio codec links to each other with the McASP of digital signal processor, Video Decoder links to each other with the Video Ports of digital signal processor, digital signal processor and ARM microprocessor all contain outside SDRAM, the FLASH circuit, digital signal processor links to each other by the HPI interface with the ARM microprocessor, ARM microprocessor and Ethernet interface, serial ports, the hard-disk interface circuit links to each other, and adopts built-in Linux operating system.
2, multiplex audio/video compression transmission server according to claim 1, it is characterized in that Video Codec links to each other with the Video Ports of digital signal processor DSP, the A channel of VPO is connected with the Video Decoder of the 1st path, the A channel of VP1 is connected with the Video Decoder of the 2nd path, the A channel of VP2 is connected with the Video Decoder of the 3rd path, the B passage of VP2 is connected with the Video Decoder of the 4th path, video encoder is connected with the A channel of VPO, and is multiplexing with the Video Decoder of the 1st path.
3, multiplex audio/video compression transmission server according to claim 1, it is characterized in that carrying out encoding compression after digital signal processor DSP is gathered in real time to the multichannel audio-video frequency signal, with ARM microprocessor shared data address, HPI adopts the mode of interrupt mode and inquiry to combine and communicates by letter by the HPI mode.
4, multiplex audio/video compression transmission server according to claim 1, it is characterized in that DSP adopts the mode of software inquiry to the transfer of data of ARM, after video coding one frame data are finished, leave dsp system running state data, audio compression data, the video compression data of needs feedback in appointment shared address zone 1 successively, this address of ARM system queries, and copy obtains data, and the network control program on the ARM is packaged into the IP bag, and sends by Ethernet interface.
5, multiplex audio/video compression transmission server according to claim 1, it is characterized in that ARM adopts the mode of interrupting to the transfer of data of DSP, after arm processor receives control command and other data by network, leave control command and other data in appointment shared address zone 2 successively, and to dsp processor transmission interruption, the dsp system response is interrupted, and obtains control command and other data, and handles accordingly.
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